Hyundai Entourage Doors Not Working

My parents have a 2008 Hyundai Entourage mini van with powered doors. They went on vacation for two weeks. Before leaving there were no problems but on their return the power opening and closing doors are not working. The doors work when depressing the key fob buttons but do not work when using the buttons in the vehicle. There are no blow fuses and the doors do open and close when actuated by the fob. I have disconnected the battery in case it was a computer glitch but the problem persists. Any clue what I should look at next?